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/*
* File...........: linux/include/asm-s390x/idals.h
* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
* Bugreports.to..: <Linux390@de.ibm.com>
* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a
* History of changes
* 07/24/00 new file
*/
#include <linux/config.h>
#include <asm/irq.h>
#define IDA_SIZE_LOG 11 /* 11 for 2k , 12 for 4k */
#define IDA_BLOCK_SIZE (1L<<IDA_SIZE_LOG)
static inline addr_t *
idal_alloc ( int nridaws )
{
if ( nridaws > 33 )
BUG();
return kmalloc(nridaws * sizeof(addr_t), GFP_ATOMIC | GFP_DMA );
}
static inline void
idal_free ( addr_t *idal )
{
kfree (idal);
}
#if defined(CONFIG_ARCH_S390X)
extern unsigned long __create_idal(unsigned long address, int count);
#endif
/*
* Function: set_normalized_cda
* sets the address of the data in CCW
* if necessary it allocates an IDAL and sets sthe appropriate flags
*/
static inline int
set_normalized_cda(ccw1_t * ccw, unsigned long address)
{
int ret = 0;
#if defined(CONFIG_ARCH_S390X)
if (((address + ccw->count) >> 31) != 0) {
if (ccw->flags & CCW_FLAG_IDA)
BUG();
address = __create_idal(address, ccw->count);
if (address)
ccw->flags |= CCW_FLAG_IDA;
else
ret = -ENOMEM;
}
#endif
ccw->cda = (__u32) address;
return ret;
}
/*
* Function: clear_normalized_cda
* releases any allocated IDAL related to the CCW
*/
static inline void
clear_normalized_cda ( ccw1_t * ccw )
{
#if defined(CONFIG_ARCH_S390X)
if ( ccw -> flags & CCW_FLAG_IDA ) {
idal_free ( (addr_t *)(unsigned long) (ccw -> cda ));
ccw -> flags &= ~CCW_FLAG_IDA;
}
#endif
ccw -> cda = 0;
}
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